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The City of Lambertville contracted Princeton Hydro and WSP to evaluate Lambertville’s need for, and ability to create, a fee‑based Stormwater Utility. Lambertville faces stormwater management issues primarily due to its geographic and infrastructural characteristics. Situated along the Delaware River, the city is prone to flooding, which is exacerbated by aging and inadequate stormwater infrastructure. Dense urban development results in a high percentage of impervious surfaces, such as roads and buildings, that prevent proper absorption of rainwater, leading to increased runoff and strain on existing drainage systems.


[caption id="attachment_19301" align="aligncenter" width="770"] Sample of single-family residential parcels and median impervious surface area[/caption]

 
Lambertville’s stormwater infrastructure includes more than 530 identified stormwater inlets, a series of aging culverts, and miles of stormwater conveyance piping—much of it in unknown condition—with many structures serving as components of cross‑jurisdictional systems, all paired with repeated devastation from flooding.



The project team completed a Lambertville Stormwater Utility Feasibility Study, which included the following components:
Programmatic and Organizational Review: Evaluation of existing stormwater infrastructure operation and maintenance practices, as well as current program organization and administration.

Gaps and Funding Analysis and Future Program Needs: Review and presentation of recent and projected capital project needs and baseline costs provided by Lambertville, along with an assessment of current revenue sources.

Land Cover Analysis, Digitization of Impervious Cover, and Equity of Current Costs: Digitization and evaluation of land cover data based on the potential use of an Equivalent Residential Unit (ERU) rate structure and the quantification of billing units. Assessment of the equity of current stormwater costs and the potential impact of a fee‑based stormwater utility on different landowner categories.

[caption id="attachment_19297" align="aligncenter" width="888"] Sankey Diagram highlighting the shift from current tax revenue to a stormwater utility fee.[/caption]

 

 

User Fee Rate Options and Summary: Evaluation of how revenue generation might shift from a general‑fund, tax‑based model to a fee‑based model, including a summary of available rate structures designed to balance equity, cost, and administrative ease.

Policy Development and Legislation Review: Examination of the policy framework for delivering stormwater management services under a utility model, including policies related to extent of service, billing, and funding. Topics included mission and program priorities, level of service, organizational structure, and credit policy.

Public Outreach & Stakeholder Engagement: Formation and facilitation of a Stormwater Focus Group composed of key stakeholders, as well as hosting a public meeting to gather feedback, ensure transparency, and support community participation.

[gallery columns="2" link="none" ids="19300,19299"]


Funding for the Lambertville Stormwater Utility Feasibility Study was provided through a grant from the New Jersey League of Conservation Voters Education Fund.
                    [post_title] => City of Lambertville - Stormwater Utility Feasibility Study
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Princeton Hydro provided consulting engineering services for the National Resources Defense Council (NRDC) concerning the implementation of the recently amended New Jersey Stormwater Management Rules. Modifications to the Stormwater Management Rules were considered which would require the use of Green Infrastructure measures to satisfy the groundwater recharge, peak flow control, and water quality requirements.
The purpose of Princeton Hydro’s consulting services was to quantify the impact of the amended rules on typical land use development within the State and to provide technical assistance to the NRDC as part of their public comment. This effort included detailed modeling and hydrologic and hydraulic calculations of hypothetical land development applications with the implementation of various Green Infrastructure measures.
[gallery columns="2" link="none" size="large" ids="17055,17054"]
An additional component of Princeton Hydro’s consulting engineering services was the participation in stakeholder meetings to discuss the potential for applicant credit for infiltration towards their peak flow rate criteria. Princeton Hydro supported the need for physically-based and scientifically sound approaches to the issue which do not jeopardize downstream properties and receiving water bodies.
Additionally, Princeton Hydro provided technical support and additional hydrologic and hydraulic calculations to quantify the impact of changing precipitation patterns on the stormwater management design process in New Jersey. The State is currently considering additional amendments to the stormwater rules which may incorporate provisions for predicted future rainfall intensities.
                    [post_title] => Natural Resources Defense Council New Jersey Stormwater Rule Analysis
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                    [post_date] => 2022-09-13 13:56:34
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Princeton Hydro was contracted by the Fairways at Lake Ridge in Lakewood Township to perform an inlet inspection of all of the stormwater inlets within the square-mile Ocean County, New Jersey community. The purpose of the inspection was to evaluate the need for retrofitting the stormwater inlets to prevent the discharge of solids and floatables from entering the Municipal Separate Storm Sewer System (MS4).
Princeton Hydro reviewed the Preliminary and Final Subdivision Plans for the community, including the grading and utility plans, and used these as the basis of the inspection. Through field inpections, Princeton Hydro identified the inlets and confirmed the locations on a site plan. The inspection also involved noting any discrepancies between the site plan and field observations, as well as documenting the condition of the inlets and MS4 compliance status.
Using geo-referenced photos, Princeton Hydro documented the condition of the inlets. The photos were then used to create a Google MyMap, depicting the exact locations of the inlets in each of the photos. The team then compiled an inlet inventory with the inlet type, condition, drainage location, and the MS4 compliance status. The inventory also noted whether or not each inlet drained to an existing stormwater basin controlled by an outlet structure with a compliant trash rack.
After the inspection and completion of the inlet inventory, Princeton Hydro wrote a letter to Lakewood Township summarizing our findings and claiming that all non-compliant inlets in roadways that drain to the community’s privately-owned and maintained basins with trash racks did not need to be retrofitted.
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                    [post_title] => Fairways at Lake Ridge Stormwater Inlet Inspection
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The City of Annapolis collaborated with Princeton Hydro to achieve compliance with its National Pollutant Discharge Elimination System (NPDES) General Permit for Discharges from Small Municipal Separate Storm Sewer Systems (MS4).
The project began with mapping the storm sewer system, focusing on the subwatershed with the highest percentage of impervious surfaces. Using GPS equipment and GIS software, the team mapped the existing storm sewer infrastructure, inspected outfalls for potential illicit discharges, and traced any detected sources of contamination. During these inspections, the team identified and verified both mapped and previously undocumented storm sewer inlets, outlets, and manholes. The team also assessed the condition of each structure, collecting data on internal connections, including type, size, direction, and material.
All collected data was integrated into a GIS-based database, providing the City with a comprehensive and actionable map of its storm sewer network.
Princeton Hydro has also prepared the Standard Operating Procedures manual for this work and helped to prepare the City’s Good Housekeeping and Pollution Prevention Plans for City-owned facilities that discharge stormwater. Future work for the City will include completing an inventory and map of the remaining subwatersheds, continuing to inspect outfalls and identify Illicit Discharges, and developing new and innovative ways for the City to treat existing stormwater.
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                    [post_title] => City of Annapolis Stormwater Mapping, Inventory, and Assessment for MS4 Compliance
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The City of Lambertville contracted Princeton Hydro and WSP to evaluate Lambertville’s need for, and ability to create, a fee‑based Stormwater Utility. Lambertville faces stormwater management issues primarily due to its geographic and infrastructural characteristics. Situated along the Delaware River, the city is prone to flooding, which is exacerbated by aging and inadequate stormwater infrastructure. Dense urban development results in a high percentage of impervious surfaces, such as roads and buildings, that prevent proper absorption of rainwater, leading to increased runoff and strain on existing drainage systems.


[caption id="attachment_19301" align="aligncenter" width="770"] Sample of single-family residential parcels and median impervious surface area[/caption]

 
Lambertville’s stormwater infrastructure includes more than 530 identified stormwater inlets, a series of aging culverts, and miles of stormwater conveyance piping—much of it in unknown condition—with many structures serving as components of cross‑jurisdictional systems, all paired with repeated devastation from flooding.



The project team completed a Lambertville Stormwater Utility Feasibility Study, which included the following components:
Programmatic and Organizational Review: Evaluation of existing stormwater infrastructure operation and maintenance practices, as well as current program organization and administration.

Gaps and Funding Analysis and Future Program Needs: Review and presentation of recent and projected capital project needs and baseline costs provided by Lambertville, along with an assessment of current revenue sources.

Land Cover Analysis, Digitization of Impervious Cover, and Equity of Current Costs: Digitization and evaluation of land cover data based on the potential use of an Equivalent Residential Unit (ERU) rate structure and the quantification of billing units. Assessment of the equity of current stormwater costs and the potential impact of a fee‑based stormwater utility on different landowner categories.

[caption id="attachment_19297" align="aligncenter" width="888"] Sankey Diagram highlighting the shift from current tax revenue to a stormwater utility fee.[/caption]

 

 

User Fee Rate Options and Summary: Evaluation of how revenue generation might shift from a general‑fund, tax‑based model to a fee‑based model, including a summary of available rate structures designed to balance equity, cost, and administrative ease.

Policy Development and Legislation Review: Examination of the policy framework for delivering stormwater management services under a utility model, including policies related to extent of service, billing, and funding. Topics included mission and program priorities, level of service, organizational structure, and credit policy.

Public Outreach & Stakeholder Engagement: Formation and facilitation of a Stormwater Focus Group composed of key stakeholders, as well as hosting a public meeting to gather feedback, ensure transparency, and support community participation.

[gallery columns="2" link="none" ids="19300,19299"]


Funding for the Lambertville Stormwater Utility Feasibility Study was provided through a grant from the New Jersey League of Conservation Voters Education Fund.
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